Parallel Keys-Metric BS 4235

BS 4235: Part 1: 1972 Parallel Keys (Metric) are precision-engineered machine keys designed to transmit torque between shafts and hub components such as gears, pulleys, sprockets, and couplings. Manufactured in compliance with British Standard specifications, these keys ensure accurate fitment, uniform load distribution, and reliable mechanical performance.
Produced from high-grade C45 / EN8 / EN9 key steel, our parallel keys offer excellent strength, dimensional accuracy, and wear resistance. Available in standard metric sizes with square or rectangular cross-sections, they can be supplied in bright, black, hardened, or custom finishes as per industrial requirements.
Widely used in automotive, heavy engineering, textile machinery, pump manufacturing, and CNC equipment industries.